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US 5,700,562 AGranted
Flexible printed circuit and manufacturing method therefor
AssigneeNitto Denko Corporation
InventorsToshihiko Sugimoto, Chiharu Miyaake, Yousuke Miki
Life of this patent
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Abstract
A composite sheet comprises a first resin film; and a second resin film laminated on the first resin film; wherein two ellipses of coefficient of linear expansion are created on polar coordinates in corresponding parts of the first and second resin films by a predetermined method and the two ellipse are overlapped so as to match in the center point and coordinate axes X and Y, and the maximum value of a linear expansion coefficient difference between the two resin films is equal to or less than a predetermined value.
Claims33
A composite sheet comprising:
- a first resin film having a first linear expansion coefficient ellipse defined by a pair of first polar coordinate axes and a first base point located at an intersection of the first axes;
- and
- a second resin film having a second linear expansion coefficient ellipse defined by a second pair of polar coordinate axes and a second base point located at an intersection of the second axes;
- the second resin film being laminated on the first resin film such that the second ellipse overlaps the first ellipse with the first axes coinciding with the second axes and the first base point coinciding with the second base point;
- wherein the first and second linear expansion coefficient ellipses are a set of distances from the first and second base points, respectively, representing magnitudes of linear expansion coefficients of the first and second resin films, respectively, in directions having a measurement angle .theta. with respect to one of the first axes and the corresponding one of the second axes, respectively;
- and
- wherein a maximum difference between a linear expansion coefficient having the measurement angle .theta. of the first resin film and a linear expansion coefficient having the measurement angle .theta. of the second resin film is equal to or less than 1.4.times.10.sup.-5 (1/.degree. C.).
4 more elements
A composite sheet comprising:
- a first resin film having a first linear expansion coefficient ellipse defined by a pair of first polar coordinate axes and a first base point located at an intersection of the first axes;
- and
- a second resin film having a second linear expansion coefficient ellipse defined by a second pair of polar coordinate axes and a second base point located at an intersection of the second axes;
- the second resin film being laminated on the first resin film such that the second ellipse overlaps the first ellipse with the first axes coinciding with the second axes and the first base point coinciding with the second base point;
- wherein the first and second linear expansion coefficient ellipses are a set of distances from the first and second base points, respectively, representing magnitudes of linear expansion coefficients of the first and second resin films, respectively, in directions having a measurement angle .theta. with respect to one of the first axes and the corresponding one of the second axes, respectively:
- and
- wherein a total area of portions where the first and second ellipses do not overlap is equal to or less than 6.5.times.10.sup.-10 ((1/.degree. C.).times.(1/.degree. C.).
4 more elements
A composite sheet comprising:
- a first resin film having a first ultrasonic propagation velocity ellipse defined by a pair of first polar coordinate axes, having a crystal orientation main axis in a long-axis direction and a crystal orientation subaxis in a short-axis direction, and a first base point located at an intersection of the first axes;
- and
- a second resin film having a second ultrasonic propagation velocity ellipse defined by a second pair of polar coordinate axes, having a crystal orientation main axis in a long-axis direction and a crystal orientation subaxis in a short-axis direction, and a second base point located at an intersection of the second axes;
- the second resin film being laminated on the first resin film such that the second ellipse overlaps the first ellipse with the first axes coinciding with the second axes and the first base point coinciding with the second base point;
- wherein the first and second ultrasonic propagation velocity ellipses are a set of distances from the first and second base points, respectively, representing magnitudes of ultrasonic propagation velocities of the first and second resin films, respectively, in directions having a measurement angle .theta. with respect to one of the first axes and the corresponding one of the second axes, respectively;
- and
- wherein a shift angle difference between crystal orientation main axes of the ellipses (.DELTA..theta.) is within 30 degrees.
4 more elements
Dependencies are inferred from the claim text.